Answer
$$2x-2-6x^2+3x^2-3x^2-6=-6x^2+2x-8$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}2x-2-6x^2+3x^2-3x^2-6& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x-2-6x^2+(-6) \xlongequal{ } \\[1 em] & \xlongequal{ }2x-2-6x^2-6 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-6x^2+2x-8\end{aligned} $$ | |
| ① | Combine like terms: $$ \, \color{blue}{ \cancel{3x^2}} \, \, \color{blue}{ -\cancel{3x^2}} \,-6 = -6 $$ |
| ② | Combine like terms: $$ 2x \color{blue}{-2} -6x^2 \color{blue}{-6} = -6x^2+2x \color{blue}{-8} $$ |
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